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Fallback bridging is also known as VLAN bridging. It bridges two or more VLANs and/or routed ports together into a single bridge domain to bridge non IP protocols. A set of Switch Virtual Interfaces (SVI - each representing a VLAN) and/or routed ports (RP) can be grouped together to form a bridge group. Each SVI/RP can be associated with a single bridge group only. If the destination MAC address of a non-IP packet has already been learnt on the bridge group, the packet is simply forwarded to the respective port. If an address is not yet learnt, the packet is flooded on all VLANs and RPs in the bridge group. Fallback bridging uses a separate spanning tree (VLAN bridge STP) to prevent loops.
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